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Appendix A
Detailed DeviceNet Specifications
Data Size and Connection Types
If the connection type can be set when another company’s configurator is being used, select a connection sup-
ported by the DeviceNet Communications Unit.
The following table shows the connection types and data sizes for OMRON DeviceNet Communications Units.
Note
The size of the IN/OUT Areas depends on the setting.
DeviceNet I/O communications support the following types of connections.
Model
Supported connections
Data size (bytes)
Poll
Bit strobe
Change of
state (COS)
Cyclic
IN
OUT
E5AR/ER-DRT
Yes
Yes
Yes
Yes
0 to 200
(See note.)
0 to 200
(See note.)
Connection type
Details
Remarks
Poll
Used to exchange data between the master and
individual slaves by sending and receiving com-
mands and responses. (Output data is allocated
for commands and input data is allocated for
responses).
---
Bit strobe
Used to broadcast commands from the master
and receive input responses from multiple
slaves.
By using one command only, the communica-
tions cycle time is short, but bit strobe connec-
tions can be used only with slaves with 8 or less
input points.
Change of state
(COS)
Normally, input and output data are sent by mas-
ter and slaves at regular cycles, but with a COS
connection, data is sent to the master or slave
when the master or slave data changes.
By setting a long cycle interval, the Network will
not be loaded with communications for minor
data changes, thereby improving the overall effi-
ciency of the Network.
Cyclic
Masters and slaves send output or input data at
regular cycles.
Содержание E5AR
Страница 2: ...E5AR ER Digital Controller DeviceNet Communications User s Manual Produced February 2004...
Страница 3: ...iv...
Страница 29: ...2 6 Functions Supported Only by the E5AR ER DRT Section 2 2 Operating Procedures...
Страница 43: ...3 14 How to Use the Terminals Section 3 2 Parts Installa tion and Wiring Circuit COM 12 V 4 7 K K...
Страница 79: ...6 8 Message Communications Performance Section 6 2 Communications Performance...
Страница 91: ...B 6 Mounted Objects Appendix B Appendix B...
Страница 95: ...C 4 DeviceNet Connection Hardware Appendix C Appendix C...
Страница 97: ...G 2 Glossary...
Страница 100: ...Index I 3 W wiring 3 10 precautions 3 9 write mode 4 12...
Страница 101: ...I 4 Index...